diff --git a/url/setters_tests.json b/url/setters_tests.json
index 8adb25ce977a8a4..bdb12a6ecf01509 100644
--- a/url/setters_tests.json
+++ b/url/setters_tests.json
@@ -27,7 +27,7 @@
             "href": "a://example.net",
             "new_value": "",
             "expected": {
-                "href": "a://example.net/",
+                "href": "a://example.net",
                 "protocol": "a:"
             }
         },
@@ -35,7 +35,7 @@
             "href": "a://example.net",
             "new_value": "b",
             "expected": {
-                "href": "b://example.net/",
+                "href": "b://example.net",
                 "protocol": "b:"
             }
         },
@@ -44,7 +44,7 @@
             "href": "a://example.net",
             "new_value": "B",
             "expected": {
-                "href": "b://example.net/",
+                "href": "b://example.net",
                 "protocol": "b:"
             }
         },
@@ -53,7 +53,7 @@
             "href": "a://example.net",
             "new_value": "é",
             "expected": {
-                "href": "a://example.net/",
+                "href": "a://example.net",
                 "protocol": "a:"
             }
         },
@@ -62,7 +62,7 @@
             "href": "a://example.net",
             "new_value": "0b",
             "expected": {
-                "href": "a://example.net/",
+                "href": "a://example.net",
                 "protocol": "a:"
             }
         },
@@ -71,7 +71,7 @@
             "href": "a://example.net",
             "new_value": "+b",
             "expected": {
-                "href": "a://example.net/",
+                "href": "a://example.net",
                 "protocol": "a:"
             }
         },
@@ -79,7 +79,7 @@
             "href": "a://example.net",
             "new_value": "bC0+-.",
             "expected": {
-                "href": "bc0+-.://example.net/",
+                "href": "bc0+-.://example.net",
                 "protocol": "bc0+-.:"
             }
         },
@@ -88,7 +88,7 @@
             "href": "a://example.net",
             "new_value": "b,c",
             "expected": {
-                "href": "a://example.net/",
+                "href": "a://example.net",
                 "protocol": "a:"
             }
         },
@@ -97,7 +97,7 @@
             "href": "a://example.net",
             "new_value": "bé",
             "expected": {
-                "href": "a://example.net/",
+                "href": "a://example.net",
                 "protocol": "a:"
             }
         },
@@ -140,7 +140,7 @@
             "href": "ssh://me@example.net",
             "new_value": "http",
             "expected": {
-                "href": "ssh://me@example.net/",
+                "href": "ssh://me@example.net",
                 "protocol": "ssh:"
             }
         },
@@ -148,7 +148,7 @@
             "href": "ssh://me@example.net",
             "new_value": "gopher",
             "expected": {
-                "href": "ssh://me@example.net/",
+                "href": "ssh://me@example.net",
                 "protocol": "ssh:"
             }
         },
@@ -156,7 +156,7 @@
             "href": "ssh://me@example.net",
             "new_value": "file",
             "expected": {
-                "href": "ssh://me@example.net/",
+                "href": "ssh://me@example.net",
                 "protocol": "ssh:"
             }
         },
@@ -1114,6 +1114,33 @@
                 "href": "http://example.net/%3F",
                 "pathname": "/%3F"
             }
+        },
+        {
+            "comment": "# needs to be encoded",
+            "href": "http://example.net",
+            "new_value": "#",
+            "expected": {
+                "href": "http://example.net/%23",
+                "pathname": "/%23"
+            }
+        },
+        {
+            "comment": "? needs to be encoded, non-special scheme",
+            "href": "sc://example.net",
+            "new_value": "?",
+            "expected": {
+                "href": "sc://example.net/%3F",
+                "pathname": "/%3F"
+            }
+        },
+        {
+            "comment": "# needs to be encoded, non-special scheme",
+            "href": "sc://example.net",
+            "new_value": "#",
+            "expected": {
+                "href": "sc://example.net/%23",
+                "pathname": "/%23"
+            }
         }
     ],
     "search": [
diff --git a/url/urltestdata.json b/url/urltestdata.json
index 575793511490796..7ce84a2c12329ff 100644
--- a/url/urltestdata.json
+++ b/url/urltestdata.json
@@ -553,7 +553,7 @@
   {
     "input": "foo://",
     "base": "http://example.org/foo/bar",
-    "href": "foo:///",
+    "href": "foo://",
     "origin": "null",
     "protocol": "foo:",
     "username": "",
@@ -561,7 +561,7 @@
     "host": "",
     "hostname": "",
     "port": "",
-    "pathname": "/",
+    "pathname": "",
     "search": "",
     "hash": ""
   },
@@ -4754,5 +4754,151 @@
     "pathname": "/",
     "search": "",
     "hash": ""
+  },
+  "# Non-special-URL path tests",
+  {
+    "input": "sc://ñ",
+    "base": "about:blank",
+    "href": "sc://%C3%B1",
+    "origin": "null",
+    "protocol": "sc:",
+    "username": "",
+    "password": "",
+    "host": "%C3%B1",
+    "hostname": "%C3%B1",
+    "port": "",
+    "pathname": "",
+    "search": "",
+    "hash": ""
+  },
+  {
+    "input": "sc://ñ?x",
+    "base": "about:blank",
+    "href": "sc://%C3%B1?x",
+    "origin": "null",
+    "protocol": "sc:",
+    "username": "",
+    "password": "",
+    "host": "%C3%B1",
+    "hostname": "%C3%B1",
+    "port": "",
+    "pathname": "",
+    "search": "?x",
+    "hash": ""
+  },
+  {
+    "input": "sc://ñ#x",
+    "base": "about:blank",
+    "href": "sc://%C3%B1#x",
+    "origin": "null",
+    "protocol": "sc:",
+    "username": "",
+    "password": "",
+    "host": "%C3%B1",
+    "hostname": "%C3%B1",
+    "port": "",
+    "pathname": "",
+    "search": "",
+    "hash": "#x"
+  },
+  {
+    "input": "#x",
+    "base": "sc://ñ",
+    "href": "sc://%C3%B1#x",
+    "origin": "null",
+    "protocol": "sc:",
+    "username": "",
+    "password": "",
+    "host": "%C3%B1",
+    "hostname": "%C3%B1",
+    "port": "",
+    "pathname": "",
+    "search": "",
+    "hash": "#x"
+  },
+  {
+    "input": "?x",
+    "base": "sc://ñ",
+    "href": "sc://%C3%B1?x",
+    "origin": "null",
+    "protocol": "sc:",
+    "username": "",
+    "password": "",
+    "host": "%C3%B1",
+    "hostname": "%C3%B1",
+    "port": "",
+    "pathname": "",
+    "search": "?x",
+    "hash": ""
+  },
+  {
+    "input": "sc://?",
+    "base": "about:blank",
+    "href": "sc://?",
+    "protocol": "sc:",
+    "username": "",
+    "password": "",
+    "host": "",
+    "hostname": "",
+    "port": "",
+    "pathname": "",
+    "search": "",
+    "hash": ""
+  },
+  {
+    "input": "sc://#",
+    "base": "about:blank",
+    "href": "sc://#",
+    "protocol": "sc:",
+    "username": "",
+    "password": "",
+    "host": "",
+    "hostname": "",
+    "port": "",
+    "pathname": "",
+    "search": "",
+    "hash": ""
+  },
+  {
+    "input": "///",
+    "base": "sc://x/",
+    "href": "sc:///",
+    "protocol": "sc:",
+    "username": "",
+    "password": "",
+    "host": "",
+    "hostname": "",
+    "port": "",
+    "pathname": "/",
+    "search": "",
+    "hash": ""
+  },
+  {
+    "input": "////",
+    "base": "sc://x/",
+    "href": "sc:////",
+    "protocol": "sc:",
+    "username": "",
+    "password": "",
+    "host": "",
+    "hostname": "",
+    "port": "",
+    "pathname": "//",
+    "search": "",
+    "hash": ""
+  },
+  {
+    "input": "////x/",
+    "base": "sc://x/",
+    "href": "sc:////x/",
+    "protocol": "sc:",
+    "username": "",
+    "password": "",
+    "host": "",
+    "hostname": "",
+    "port": "",
+    "pathname": "//x/",
+    "search": "",
+    "hash": ""
   }
 ]